US 12,156,721 B2
Method and apparatus for optically measuring blood pressure
Ilya Fine, Rehovot (IL); and Alexander Kaminsky, Tbilisi (GE)
Assigned to ELFI-TECH LTD., Rehovot (IL)
Filed by ELFI-TECH LTD., Rehovot (IL)
Filed on Nov. 23, 2021, as Appl. No. 17/533,455.
Application 17/533,455 is a continuation in part of application No. 16/382,255, filed on Apr. 12, 2019, granted, now 11,350,837.
Application 16/382,255 is a continuation in part of application No. 15/938,533, filed on Mar. 28, 2018, granted, now 11,134,901, issued on Oct. 5, 2021.
Application 15/938,533 is a continuation of application No. PCT/IB2017/053339, filed on Jun. 7, 2017.
Application PCT/IB2017/053339 is a continuation in part of application No. 15/474,963, filed on Mar. 30, 2017, abandoned.
Application 16/382,255 is a continuation of application No. PCT/IB2017/051139, filed on Oct. 15, 2017.
Application PCT/IB2017/051139 is a continuation in part of application No. 15/729,720, filed on Oct. 11, 2017, abandoned.
Claims priority of provisional application 62/407,429, filed on Oct. 12, 2016.
Claims priority of provisional application 62/315,010, filed on Mar. 30, 2016.
Prior Publication US 2022/0183579 A1, Jun. 16, 2022
This patent is subject to a terminal disclaimer.
Int. Cl. A61B 5/0225 (2006.01); A61B 5/022 (2006.01); A61B 5/026 (2006.01)
CPC A61B 5/02255 (2013.01) [A61B 5/02241 (2013.01); A61B 5/0261 (2013.01)] 14 Claims
OG exemplary drawing
 
1. A system for optically measuring a systolic and/or diastolic blood pressure of a mammal, the system comprising:
a. a rigid restrictor defining an optically transparent region therein;
b. an inflatable cushion, at least a portion of a sealing barrier of the inflatable cushion being flexible and optically transparent (FOT), the cushion being mechanically coupled to the rigid restrictor so that during inflation of the cushion, a presence of the rigid restrictor restricts a range of motion of gas or liquid within the inflated cushion and biases inflation-driven motion of the FOT barrier portion in a direction away from the rigid restrictor;
c. an optical blood-motion sensor comprising a laser and a light detector both of which are attached to the rigid restrictor and oriented so that when the cushion is inflated so that the FOT barrier portion applies pressure to the biological tissue of the mammal:
A. light emitted by the laser is scattered by the pressure-applied biological tissue after passing through the optically transparent region of the rigid restrictor, the pressure-applying FOT barrier portion of the inflated cushion, and the inflated cushion interior; and
B. the tissue-scattered laser light is received by the light detector after passing through the pressure-applying FOT barrier portion of the inflated cushion, the inflated cushion interior and the optically transparent region of the rigid restrictor;
iii. output of the light detector is electronically processed to compute therefrom a pressure-applied tissue blood motion signal descriptive of blood motion in the biological tissue when subjected to the applied pressure; and
c. blood pressure circuitry configured to compute a systolic and/or diastolic blood pressure of the mammal by correlating a measurement of a pressure within the inflated cushion with the pressure-applied tissue blood motion signal computed by the optical blood-movement sensor.